I don't even need to read the entire damn thing to know it is right.
1. Every animal on this planet... that also includes us has been in a constant conflict every since creation.
2. Just take a look around you in your own. Realize how much "micro"-conflict there constantly is between people. Most people find each other annoying and to be idiots, then you just scale that up a notch, and you have tribes, states, countries, and religions at war.
I honestly don't have enough imagination to imagine a world in peace and harmony, based on our history, and based on observing people in my own life being in conflict constantly about endless amount of crap.
How do you the world to be at peace, when 2 people don't even understand each other, and find each other to be super morons?
We can't barely live in the same house anymore, without wanting to kill each other. Then how the fuck is tribes, states, countries, and religions then supposed to tolerate each other and be at peace?
So yes you have to realize, understand, and accept the world is in a constant state of conflict, and war, and you better make your own chances of survival the best you can, with the talents you have as an individual person.
Are you are strong person physically? Well, then train your fighting abilities? Are you great at networking? Well then find people who share the same conviction as you and strengthen that network and community, whatever you can to increase your own chances of survival, or your tribe's chances, because if the tribe get's wiped out, well, then your chances are not looking too bright.